Tricks and Tips with NIO Using the Grizzly Framework

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Tricks and Tips with NIO Using the Grizzly Framework YOUR LOGO HERE Tricks and Tips With NIO Using the Grizzly Framework Jeanfrancois Arcand, Senior Staff Engineer Charlie Hunt, Senior Staff Engineer Scott Oaks, Senior Staff Engineer SUN Microsystems TS-2992 2007 JavaOneSM Conference | Session TS-2992 | Goal of Your Talk Tricks and Tip with NIO In this session, we discuss tricks and tips we have learned working on the Project Grizzly NIO Framework. We will describe how to efficiently manage ByteBuffers, how to properly handle SelectionKeys, recommend threading and buffer management techniques, and talk about an efficient NIO/SSL implementation. 2007 JavaOneSM Conference | Session TS-2992 | 2 Agenda Introduction What Is Project Grizzly Project Grizzly Performance Overview of NIO Tricks and Tips Summary 2007 JavaOneSM Conference | Session TS-2992 | 3 Agenda Introduction What Is Project Grizzly Project Grizzly Performance Overview of NIO Tricks and Tips Summary 2007 JavaOneSM Conference | Session TS-2992 | 4 Introduction ™ ● Implementing scalable servers in Java platform can be difficult ● Almost impossible prior to Java technology- based NIO ● Using Java technology-based NIO effectively can be a challenge ● Project Grizzly eliminates many of these challenges ● In this session we present many of the tips and tricks we learned while implementing Project Grizzly to build scalable servers using Java technology- based NIO 2007 JavaOneSM Conference | Session TS-2992 | 5 Introduction What we will talk about in this session ● Give a brief history of Project Grizzly ● How Project Grizzly was born ● Current state of Project Grizzly ● Show Project Grizzly’s performance and scalability ● Familiarize ourselves with Java technology-based NIO package ● Present several of the tips-and-tricks effectively using Java technology-based NIO as we learned implementing Project Grizzly 2007 JavaOneSM Conference | Session TS-2992 | 6 Agenda Introduction What Is Project Grizzly Project Grizzly Performance Overview of NIO Tricks and Tips Summary 2007 JavaOneSM Conference | Session TS-2992 | 7 What Is Project Grizzly Project Grizzly (current Grizzly Framework) ● Uses Java technology-based NIO primitives and hides the complexity of programming with Java technology-based NIO ● Easy-to-use high-performance APIs for TCP, UDP and SSL communications ● Brings non-blocking sockets to the protocol processing layer ● Utilizes high-performance buffers and buffer management ● Choice of several different high-performance thread pools 2007 JavaOneSM Conference | Session TS-2992 | 8 What Is Project Grizzly History of Project Grizzly ● Project Grizzly was born in 2004 under the GlassFish™ project, (https://glassfish.dev.java.net) ● Initially built as an HTTP Web Server, replacing Tomcat’s Coyote Connector and Sun WebServer 6 ● Later became known as Grizzly 1.0. ● Grizzly 1.0 shipped with Sun Java System Application Server 8.1 PE, 8.2 PE/EE and all GlassFish project distributions, replacing native Sun WebServer software runtime 2007 JavaOneSM Conference | Session TS-2992 | 9 What Is Project Grizzly History of Project Grizzly ● Grizzly 1.0 became extremely popular in 2006; Multiple protocol implementations were built on top of it ● But Grizzly 1.0 had HTTP protocol specific implementation details included in its transport logic ● The main class, SelectorThread, contained several artifacts specific to http such as file caching, request monitoring, etc. 2007 JavaOneSM Conference | Session TS-2992 | 10 What Is Project Grizzly History of Project Grizzly ● Several classes needed to be extended in order to use the framework ● Example: JettySelectorThread extends SelectorThread ● Example: SSLSelectorThread extends SelectorThread ● The Grizzly 1.0 mixed ‘extension’ and ‘implementation’ 2007 JavaOneSM Conference | Session TS-2992 | 11 What Is Project Grizzly History of Project Grizzly ● But, Grizzly 1.0 was still a good choice for nearly all TCP/HTTP-based protocols ● Projects successfully utilizing Grizzly 1.0: ● JRuby On Grizzly ● Project Alaska’s HTTP BC component ● GlassFish build v3 micro kernel ● Phobos in NetBeans™ software ● SOAP over TCP integration in GlassFish project ● Comet / Cometd ● AsyncWeb on Grizzly ● GlassFish build v2 ● Sun Web 2.0 Developer pack (REST HTTP Server) 2007 JavaOneSM Conference | Session TS-2992 | 12 What Is Project Grizzly Open Source Grizzly ● Grizzly 1.5 began development in 2006 ● Grizzly 1.5 objectives ● Remove all dependencies on HTTP and/or GlassFish project ● All 1.0 applications must still work with 1.5 ● Support all tricks and tips learned during development of Grizzly 1.0 (performance, NIO performance gotchas, etc.) ● Keep it simple!! ● Grizzly 1.5 Open Sourced February 6, 2007, https://grizzly.dev.java.net ● Grizzly 1.5 officially released as of 2007 JavaOneSM Conference!! 2007 JavaOneSM Conference | Session TS-2992 | 13 What Is Project Grizzly Who’s looking at Grizzly 1.5 ? ™ ● Sun JDK Software ORB ● GlassFish Project ORB ● Sun Java System Message Queue Software ● Sun Labs Project(s) ● Several enterprise/middleware companies ● …and many more (subscribe to Project Grizzly’s mailing list to learn who!!!) 2007 JavaOneSM Conference | Session TS-2992 | 14 What Is Project Grizzly Where to find Project Grizzly ● Open Source Project on java.net, (https://grizzly.dev.java.net) ● Open Sourced under CDDL license ● Very open community policy ● All project communications are done on Project Grizzly mailing list; No internal, off mailing list conversations ● Project meetings open to anyone, (public conference call) ● Project decisions are made by project member vote ● No project member has more voting power than any other project member 2007 JavaOneSM Conference | Session TS-2992 | 15 Agenda Introduction What Is Project Grizzly Project Grizzly Performance Overview of NIO Tricks and Tips Summary 2007 JavaOneSM Conference | Session TS-2992 | 16 Project Grizzly Performance How did we performance test? ● Client load generated via faban ● faban.sunsource.net ● Two modes of measurement ● Throughput ● Limited # of clients ● No Think Time ● Scalability ● Max # of clients with 90% response time metric ● Think time 2007 JavaOneSM Conference | Session TS-2992 | 17 Project Grizzly Performance Comparing Project Grizzly to Apache MINA both running AsyncWeb ● What is MINA? ● Apache MINA (Multipurpose Infrastructure for Network Applications) is a network application framework which helps users develop high performance and high scalability network applications easily ● What is AsyncWeb? ● AsyncWeb is a high-throughput, non-blocking Java platform HTTP engine—Designed throughout to support asynchronous request processing; AsyncWeb is built on top of MINA 2007 JavaOneSM Conference | Session TS-2992 | 18 Project Grizzly vs. Apache MINA Both Running AsyncWeb Higher is better, normalized to Grizzly score 100.00% 90.00% 80.00% 70.00% Grizzly 60.00% Mina 50.00% 40.00% 30.00% 20.00% 10.00% 0.00% Total Throughput Scalability Source: Internal Benchmark Tests 2007 JavaOneSM Conference | Session TS-2992 | 19 GlassFish vs. Tomcat Higher is better, normalized to Grizzly score 120.00% 110.00% 100.00% 90.00% 80.00% GlassFish 70.00% Tomcat 60.00% 50.00% 40.00% 30.00% 20.00% 10.00% 0.00% Total Throughput Scalability Source: Internal Benchmark Tests 2007 JavaOneSM Conference | Session TS-2992 | 20 Project Grizzly Performance Project Grizzly HTTP performance Tested against a benchmark designed to: ● Measure scalability, specifically to measure how many concurrent clients can be supported with: ● Average client think time of 8 seconds ● 90% response time within 3 seconds ● Error rate < 0.1% 2007 JavaOneSM Conference | Session TS-2992 | 21 Project Grizzly HTTP vs. Other HTTP Servers Higher is better 3000 Traditional I/O 2750 C-Based Server 2500 C-Based Server 2250 Grizzly 2000 1750 1500 1250 1000 % of Traditional% Score I/O 750 500 250 0 2 CPU 6 CPU 16 CPU 2007 JavaOneSM Conference | Session TS-2992 | 22 Agenda Introduction What Is Project Grizzly Project Grizzly Performance Overview of NIO Tricks and Tips Summary 2007 JavaOneSM Conference | Session TS-2992 | 23 Overview of NIO Blocking or non-blocking? ● Traditional java.net.Sockets are blocking— They block, wait/sleep for data ● NIO Channels can be blocking or non-blocking ● Non-blocking Channels never put the invoking thread to sleep; Operations either complete right away or return a result indicating nothing was done ● Non-blocking makes it easy to manage many channels simultaneously ● Blocking channels encourages “one thread per connection” paradigm ● NIO Channels must be configured, blocking or non-blocking 2007 JavaOneSM Conference | Session TS-2992 | 24 Overview of NIO Selector—Basic abstraction to enable multiplexed I/O ● Register one or more ‘selectable’ channels (i/o) ● Relationship between channel and selector represented by a selection key (SelectionKey) ● Selection key remembers the events you are interested in ● Selector’s select() method updates the keys which are “ready” ● Service each channel by iterating over the keys which are “ready” 2007 JavaOneSM Conference | Session TS-2992 | 25 Overview of NIO Buffer and ByteBuffer ● Containers for handling data ● Work very well together with Channels ● High performing if done right! ● To use Buffers, you must understand ● Capacity—Max number of elements ● Limit—Count of “live” elements, don’t read/write beyond ● Position—Index of next element to read/write ● Mark—A remembered position ● 0 ← mark ← position ← limit ← capacity 2007 JavaOneSM Conference | Session TS-2992 | 26 Overview of NIO Two Flavors of ByteBuffers ● ByteBuffers—two
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